what work is needed to swap out the engine from a 2003 Mitsubishi Lancer Oz rally edition to a 300 ZX twin turbo engine? As the motor in Lancer is shot

 

Well the lancer is a transverse mount 4 cylinder with front wheel drive. The 300zx is a v6 longitudinal mount rear wheel drive. While technically possible it is beyond impractical, and financially prohibitive to be something worth considering. IMO

Rebuild the engine or sell the car.